I'm in the process of migrating an older database server to a new instance of SQL Server 2017 via database mirroring. The old server appears to have a database mirroring endpoint already created. I'd like to drop this and create a new one utilizing windows authentication rather than certificates. What would be the best way to ensure that the old endpoint is no longer being used? sys.database_mirroring has null values in each column for every database ID listed. Is it safe to assume that it is safe to remove the endpoint?